I was trying to spec someone play a standard map, but when I start specing, it shows him playing a taiko map instead.
During the play, you can see him hitting both d and both k notes at seemingly random intervals, sometimes missing doesn't register, and sometimes the combo counter jumps up to a number like 60 even though he isn't actually hitting any notes.

Map player is playing: Random graveyarded standard maps

Map shown instead: Last Fortune (remix)

This is the second time I saw this bug, but I have no idea what's causing this.
Note: He told me that it shows me having all the maps he is playing, despite me not actually having them.